Xuyang Wang, Yan-ping Wang
The hardware of this system is mainly composed of full-bridge DC/AC-AC/DC circuit system and DSP control circuit system, including DSP control system, AD sampling circuit, single-phase full-bridge circuit, transformer circuit and filter circuit. The DSP outputs eight PWM signals to control the on/off of the inverter MOS tube. The output is fed back by the current-voltage transformer, sampled by the A/D converter, and transmitted to the DSP control circuit to adjust the output to form a closed-loop control. Among them, the inverter link adopts single-phase full-bridge inverter circuit, SPWM control method with single-pole frequency multiplication, segmented synchronous modulation voltage frequency; constructs coordinate system through virtual orthogonal vector, and real-time voltage on inverter output side control. The energy feedback link uses a feedforward direct current controlled single-phase full-bridge PWM rectifier to improve energy feedback efficiency by adjusting the power factor. Finally, the software and hardware systems are jointly debugged, and the hardware and software have achieved the intended purpose.
SPWM, Synchronous Modulation, Virtual Quadrature Vector, PWM Rectification, DSP